Specifications

8
A motor starter unit has four basic functions:
Isolation of the load from the main power supply, -
Protection against short-circuit, -
Protection against overload, -
Control (start, stop, speed). -
Each motor starter unit can be enhanced with additional functions depending on its system requirements:
Power: speed controller, soft starter, phase reversal, etc, -
Control: auxiliary contacts, time-delay, communication, etc. -
Starter are selected based on the power and control specications
Direct on line
starter
A1A2
M
C.U.
M
TeSys U starter controller b
is an integrated Direct On Line starter up to 15kW which performs the following
functions:
protection and control of single-phase or 3-phase motors: v
breaker function, -
overload and short-circuit protection, -
thermal overload protection and power switching, -
control of the application: v
protection-function alarms, -
application monitoring (running time, number of faults, motor current values, ...), -
logs (last 5 faults saved, together with motor parameter values). -
These functions can be added by selecting control units and function modules
which simply clip into the power base. The product can therefore be customised at
the last moment.
Motor starter
basic functions
Power
specications
related to the
load
Direct on line starter b
This solution comprised a magneto-thermal breaker and a contactor that covers the
power range up to 110kW. It provides the following basic functions:
Protection against short circuit
Protection against overload
On/Off commutator
2-Selection phase
Selecting starter mode
The choice of starter is determined by:
Mechanical characteristics of the load (torque, inertia, speed. -
Power and electrical motor characteristics -
Necessary protections -
These criteria are used to dene one of the following solutions
Direct on line starter -
Progressive start-up with soft starters -
Start-up at variable speed with variable speed drive (VSD) -
The step for selecting and dimensioning the power part of the starter will not be developed in this document.
Readers can refer to the specic guides and Schneider Electric catalogs.